problem with central locking

Since past few days, whenver i unlock doors of my punto MJD, a peculiar motor running noise is heard from my left aft door even after doors getting unlocked (continues for few sec). However its intermittent...slowly its frequency is increasing with each opening, but no prob with locking and unlocking function. Guys did anybody ever face such problem. Any idea wat wud b the cause....:sad:

It may be due to water entered in door locking system. I also had same problem. On enquiry with my Fiat Dealer they informed it was due to water entered in Door Locking System. Without any further enquiry from my side, they promptly told me since your vehicle is under Warranty we will change it free of cost and they changed immediately. I personally appreciate the FIAT mechanic for his immediate action. Keep it up FIAT.